Inferior fascia Perineal membrane Superior fascia. People who have a higher risk should consider screening for anal cancer. Sphincters upper lower glands. Superficial inguinal lymph node below pectinate line and internal iliac lymph nodes above line. Suspensory muscle Major duodenal papilla Minor duodenal papilla Duodenojejunal flexure Brunner's glands. The transitional zone has squamous cells and glandular cells.
External anal sphincter